Improvement in boiler-flue scrapers



GEORGE H. NOYES, OF

QIEFIGF- EEIE, PENNSYLVANIA.,

IMPROVEMENT IN BOlLER-FLUE SCRAPERS.

Specification forming part of Letters Patent No. 192,786, dated July 3, 1877; application filed June 4, 1877.

To all whom it may concern Be it known that I, GEORGE H. NoYEs, of Erie, in the county of Erie and State of Penn- Sylvania, have invented new and useful Improvements in SteamBoiler-Flue Scrapers 5 and I do hereby declare the following to be` a full, clear, and exact description thereof.

My invention relates to the construction of devices known as uescrapers, which are used in removing the deposits made in the iiues of steam-boilers.

The object of my invention is to so construct a fluescraper as to have its sides dexible, so as to adjust it to various-sized fines; also to so form it that it shall present a continuous scraping surface. Another object aimed at by me is cheapness of construction, also durability, and facility of repair.

The accompanying drawing shows my invention as follows Figure l is a longitudinal section of my device. Fig. 2 is a transverse section taken on the line x m, Fig. l. Fig. 3 is a top View of one of the rib-pieces detached. Fig. 4 is an end view of one of the end pieces or caps.

The construction of my device is as follows AAis the central rod or shaft. B B B B are rib-pieces, which together form the outer shell of the body. These ribs are provided at their ends with tenons B', and on their outer faces Vthey have iin-like lugs `Z2 b b, so arranged as to present a sharp surface for scraping. These ribs B, with their lugs and tenons and ns, are cast in one solid piece.

Each rib-piece is narrower at one end than the other, and when in place the narrow end of one piece is next to the broad end of the other. This arrangement causes the scraping-fins b to break joint, so that, while the shell is 'composed of ribs which have Wide spaces between them, there is still a continuous scraping-surface presented to the inner surface of the flue.

The ribs are held in place by caps O at each end, which have mortises O, which receive the tenons B. The mortises are Asufficiently long to allow the ribs to be able to recede toward the bar A. The ribs are kept distended and made flexible in their action by means of springs D D. These springs are vmade of thin bars of steel, bent into a coil or circle. In Fig. L an elevation is shown of half of the springs, and in Fig. 2 a side View of the spring is-` shown, showing its construction. To prevent th-ese springs getting out Iof place each spring is Aperforated at some point, and two of the four ribs are provided with lugs d, which enter the perforation of the spring, and keep the spring in place. The caps C cover the whole end of the shell, and prevent dislodged matterin the iiue from working through thescraper. The caps being thus formed, the

Scrapers push all dislodged matter before them out of the iiue.

I am aware that iue-scrapers have been heretofore. made in which there were the ribs and caps and center-shaft but the ribs were not made narrower at one end than the other, and placed in the scraper as I place them. The caps, I believe, were not complete disks, closing the end of the shell, as set forth. above. The springs used heretofore, I believe, have been set lengthwise of the rib, and each rib has been provided with its own spring, while my springs act alike on all the ribs. Therefore,

l. The shell of a boiler-flue scraper, made of ribs B, 'which are narrower at' one end than the other, as and for the purposes mentioned.

2. In combination with the tapering ribs B B B B the disk-shaped caps C, as shown, and for the purposes mentioned.

3. The springs D, in combination with the ribs B, said springs having a bearing upon each of said ribs, as shown, and for the purposes mentioned.

4. The combination, within a boilertlue scraper, of the shaft A, ribs B B B B1, made tapering, and arranged as described, the disk- .shaped caps O O, and springs D D, said parts being arranged and operating together as shown, andfor the purposes mentioned.

In testimony whereof I, the said GEORGE -H. NOYES, have hereunto set my hand.

GEORGE H. NOYES. 

